Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/14950
Title: | Silica grafted polyethylenimine as heterogeneous catalyst for condensation reactions | Authors: | Ribeiro, Sonia M. Serra, Arménio. C. Gonsalves, A. M. d’A. Rocha |
Keywords: | Polyethylenimine; Silica; Heterogeneous catalysts; Knoevenagel condensation | Issue Date: | 2010 | Publisher: | Elsevier | Serial title, monograph or event: | Applied Catalysis A: General | Abstract: | Primary amine groups were attached to a silica surface by using α,ω-diamines derivatives and (3-glycidyloxypropyl)-trimethoxysilane activation. The same activation was used to graft polyethylenimine, which also contains secondary and tertiary amine groups. These silica aminated structures were tested as heterogeneous catalysts in nitroaldol condensation with nitromethane, the derivative with the polyethylenimine moiety being the more active catalyst. This catalyst also showed efficiency in the Knoevenagel condensation of benzaldehydes with ethyl cyanoacetate under very mild reaction conditions and showed much the same efficiency when used in consecutive reaction runs. A reaction mechanism with participation of the several amine groups of the catalysts is discussed. | URI: | https://hdl.handle.net/10316/14950 | ISBN: | 10.1016/j.apcata.2011.03.054 | ISSN: | 0926-860X | DOI: | 10.1016/j.apcata.2011.03.054 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Silica grafted polyethylenimine.pdf | 378.05 kB | Adobe PDF | View/Open |
SCOPUSTM
Citations
27
checked on Oct 14, 2024
WEB OF SCIENCETM
Citations
24
checked on Oct 2, 2024
Page view(s) 20
788
checked on Oct 8, 2024
Download(s) 50
551
checked on Oct 8, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.